<!--
 * @Description: 
 * @Author: ljl
 * @Date: 2024-11-05 14:41:15
 * @LastEditors: rendc
 * @LastEditTime: 2024-11-05 14:58:32
-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型</title>
    <style>
        #app{
            /* 默认状态：内容盒子 */
            /* box-sizing: content-box; */
            /* 修改为边框盒子 */
            box-sizing: order-box;
            width: 100px;
            height: 100px;
            border: 1px solid red;
            padding: 10px;
            padding-top: 20px;
            padding-left: 30px;
            margin: 10px;
            margin-bottom: 40px;
            margin-right: 80px;
            margin: 10px 20px 30px 40px;
        }
    </style>
</head>
<body>
    <div id="app">盒子模型</div>
</body>
</html>